Magnet based activity sensor
US4737774A · kind A · utility
14Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Aug 15, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/03
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An activity sensor which provides an indication of motion caused by changes in acceleration of a person or animal, and wherein such changes of motion are sensed by a movable magnet which is biased to a rest position along a guide. The axis of the path of movement of the movable magnet is substantially parallel to the direction of accelerations of interest. A Hall effect sensor is provided for sensing motions of the movable magnet from its rest position, and it provides an output proportional to these movements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.